texture rendering without filtering 2004-06-03 - By Andras Ikladi
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kim aldis wrote:
>If the min and max settings are identical, the threshold setting is
>irrelevant. You can leave it wherever.
>
>
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Does it really ensure the texture won't be blurred?
Generally rendering engines also use a different texture sampling
mechanism, not related the the main image sampling.
Ok, that you don't switch on elliptical filtering or mipmapping, but
still color calculation for a given ray hit will be an averaged sample
of 4 surrounding texels. (and in the average case, it is good cause
helps to avoid texture aliasing)
/On a side note:
There is also an intermediate (between unfiltered and elliptical)
filtering (talking about the simple filter <float> blabla thing)
supported by mr default shader libs, but looking into the output mi
files this doesn't seem to appear. Does it mean Softimage just skipped
this possibility or mixed with pyramidals, that makes sense?/
And also, various image manipulation tools also "blur" the image when
displaying/manipulating it, so i don`t think there is a way to achieve
the exact same texture as on the input side. Just compare say photoshop
and acdsee (two most common image tools).
But it is possible to get a satisfying results.
my (maybe totally trashy) .2 cents
Andras
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